Wednesday, September 26, 2012

Spreading Dogbane, Apocynum androsaemifolium, easily the handsomest of the three dogbanes that occur in Ohio. It's rather local, but widespread, and prefers damp partially shaded sites.

The flowers of Spreading Dogbane are magnificent, at least by dogbane standards. The large whitish corollas are prominently striped with pink, with a prominent outward flare to the corolla lobes.

As with the other dogbanes - and their close allies the milkweeds - Spreading Dogbane has thick milky latex coursing through its veins. Tear a leaf and you'll spark a gusher of the stuff. This latex is fairly nasty, as it is rich in toxic cardiac glycosides. The goo is an effective anti-herbivore defense, and dogbane's chemical arsenal safeguards it from most leaf-noshing caterpillars.

Photo: Alison Hunter/Wiki Commons

But not all herbivores are repelled by dogbane toxins. If you ever encounter a pale brown caterpillar that looks like an escapee from a box of pipecleaners, and it's snacking on dogbane, it's apt to be the larva of the Delicate Cycnia (Sik-nee-ah), Cycnia tenera. The caterpillars of this moth are among the few species of Lepidoptera that have successfully battled through the plants' chemical protection.

If the fuzzy caterpillars survive the threat of tachinid flies and other parasitoid predators, this is what they'll become - one of our most elegant moths. Delicate Cycnias are easily recognized by their flawless creamy-white complexion, disrupted only by a showy orange-yellow band that gilds the forewings and head.

The Delicate Cycnia seems to be pretty common and widespread in Ohio, and if you keep a watch, you're likely to encounter one.

Butterfly-weed, Asclepias tuberosa, fabled among butterfly connoisseurs for its magical ability to lure the fluttery crowd to its rich nectar. Sometimes butterflies get so punch-drunk on butterfly-weed that you can practically handle them as the insects plumb the depths of the orange blossoms.

It's not only butterflies that depend on this showy milkweed. Look carefully, and you might spot an interesting caterpillar in this shot.

We zoom in, and unmask the tubular orange beast. This is the larva of a MUCH rarer moth than the aforementioned Delicate Cycnia. What we have here is the caterpillar of the Unexpected Cycnia, Cycnia inopinatus, which is an Ohio endangered species. I photographed this cat last July in Adams County, which is one of only two Ohio regions where it is known to occur.

Unexpected Cycnia caterpillars are clad in an incredible shade of soft orange that matches the flower color of Butterfly-weed to a remarkable degree. They'll eat other species of milkweed, and probably even dogbane, but seem most at home on the Butterfly-weed. I was delighted to have the opportunity to see this caterpillar, one of several that we found in a small prairie. It wasn't entirely unexpected, though, as I was with John Howard and he knew that they could be found in this spot.

I've never seen an adult Unexpected Cycnia, but this is what they look like. Work took me to the OSU Museum of Biological Diversity today, and Dave "Mothman" Horn was kind enough to pull out a specimen so that I might photograph it. Note how the orangish forewing gilding only extends to the midwing, and this species is a bit less robust than the similar Delicate Cycnia. The label for this specimen is partially visible, and records the collection locale as the Oak Openings near Toledo. This interesting and imperiled ecosystem harbors the greatest concentration of rare flora and fauna in Ohio. Its close runner up for rarity treasure trove is the prairies of Adams County - the other Ohio region in which the Unexpected Cycnia occurs.

There are two other Cycnia species. One, the Collared Cycnia, Cycnia collaris, is a westerner that doesn't make it as far east as Ohio. The fourth species is the Oregon Cycnia, C. oregonensis, and despite its distinctly occidental name, it does occur sparingly in Ohio. I've seen it once - I think - also in Adams County. Those photos are on another drive, or I'd slap one up.

Mothing is a fascinating pursuit, and Ohio moth'ers should be in for a few treats next year. A new publication on Buckeye State moths is in the works, and a scheme is afoot to hold what should be a real "Mothapalooza".

Thanks for sharing the photos of the Delicate cycnia. I do enjoy the village of insects that rely on the milkweed plants. There are a few species of milkweed plants in my home gardens. I find Monarch eggs and caterpillars on Asclepias incarnata and A. syriaca plants but not on the A. tuberosa plants. Although the adults do enjoy the nectar. Why do you think they do not prefer Butterfly weed as a host plant?

I found what I believe to be an unexpected cycnia caterpillar last week outside Germantown, Ohio. Since it is not one of the two sites where they are known, I'm thinking maybe it came as an egg on 'Butterfly Weed for clay' from Prairie Nursery, WI, in a new prairie planting on our property. We did get a photo of the cat.

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About Me

I am a lifelong Ohioan who has made a study of natural history since the age of eight or so - longer than I can remember! A fascination with birds has grown into an amazement with all of nature, and an insatiable curiosity to learn more. One of my major ambitions is to get more people interested in nature. The more of us who care, the more likely that our natural world will survive.

About the photos, and permission to use

All photographs on these web pages are the exclusive property of Jim McCormac, and are protected under United States and International copyright laws. The photographs may not be copied, reproduced, stored, distributed or manipulated without written permission. All rights are reserved.

If you contact me requesting free photos, the reply may be long in coming :-)

I've been taking photographs for a few decades, but never became fully interested and engaged in photography until 2003. That's when I got my first digital camera. Since then, photography has become a passion and a steadily growing addiction. If you delve back far enough into this blog, you will see photos that were made with a variety of Panasonic point & shoot bridge cameras. Then came a Canon Rebel DSLR, followed by a Nikon D7000. I've since returned to Canon, and use their gear almost exclusively. My camera bodies are a Canon 5D Mark III, which is an awesome full-frame sensor camera, and a Canon 7D Mark II. The latter is a 1.6 crop factor camera, and I use it almost exclusively for birds and distant wildlife.

The lens bag includes the following Canon lenses: 100mm f/2.8L-macro; the sensational but bizarre MP-E 65 mega-macro; a 180mm f/3.5 macro; a 16-35mm f/4L wide-angle; a 50mm f/1.4; a 100-400 f4.5/5.6 II; and a 500mm f/4L II, sometimes used with a 1.4 extender (which makes it a 700mm). I've also got a Tamron 70-200mm and Sigma 24mm Art (great lenses!). I do lots of macro, and my typical flash gear is the Canon Twin-Lite setup. If the gear needs three-legged stabilization, it is mounted on an Induro tripod, attached to an Induro Gimbal head. Finally, I've got a GoPro Hero, which is fully waterproof and can be used for underwater work. Sometimes I even use the camera or video feature on my iPhone 5S smartphone - it's amazing how good phone cameras have become.

Speaking, guiding gigs 2016

NOTE: Click on listed events for details (inmost cases).

January 16, 2016 - Ohio Ornithological Society's annual winter raptor day at the Wilds, Muskingum County, Ohio. Leading field trip.